使用iText将具有表单的PDF转换为仅具有文本的PDF（保留数据）

Question

• I have multiple PDFs that get populated with multiple records (a.pdf,b.pdf,c[0-9].pdf,d[0-9].pdf,ez.pdf) using acroforms and pdfbox.
• The resulting files (aflat.pdf,bflat.pdf,c[0-9]flat.pdf,d[0-9]flat.pdf,ezflat.pdf) should have their forms(dictionaries and whatever adobe uses) removed but the fields filled as raw text saved on the pdf (setReadOnly is not what I want!).

PdfStamper can only remove fields without saving their content but I've found some references to PdfContentByte as a way to save the content. Alas, the documentation is too brief to understand how I should do this.

As a last resort I could use FieldPosition to write directly on the PDF. Has anyone ever encountered such problem? How do I solve it?

UPDATE : Saving a single page of b.pdf yields a valid bfilled.pdf but a blank bflattened.pdf . Saving the whole document solved the issue.

    populateB();
    try (PDDocument doc = new PDDocument(); FileOutputStream stream = new FileOutputStream("bfilled.pdf")) {
        //importing the page will corrupt the fields
        /*wrong approach*/doc.importPage((PDPage)pdfDocuments.get(0).getDocumentCatalog().getAllPages().get(0));
        /*wrong approach*/doc.save(stream);
        //save the whole document instead
        pdfDocuments.get(0).save(stream);//<---right approach

    }
    try (FileOutputStream stream = new FileOutputStream("bflattened.pdf")) {
        PdfStamper stamper = new PdfStamper(new PdfReader("bfilled.pdf"), stream);
        stamper.setFormFlattening(true);
        stamper.close();
    }

Answer 1

使用PdfStamper.setFormFlattening(true)摆脱字段并将它们写为内容。

Answer 2

Always use the whole page when working with acroforms

    populateB();
try (PDDocument doc = new PDDocument(); FileOutputStream stream = new FileOutputStream("bfilled.pdf")) {
    //importing the page will corrupt the fields
    doc.importPage((PDPage) pdfDocuments.get(0).getDocumentCatalog().getAllPages().get(0));
    doc.save(stream); 
    //save the whole document instead
    pdfDocuments.get(0).save(stream);

}
try (FileOutputStream stream = new FileOutputStream("bflattened.pdf")) {
    PdfStamper stamper = new PdfStamper(new PdfReader("bfilled.pdf"), stream);
    stamper.setFormFlattening(true);
    stamper.close();
}